77680297 has 2 divisors, whose sum is σ = 77680298. Its totient is φ = 77680296.

The previous prime is 77680271. The next prime is 77680301. The reversal of 77680297 is 79208677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39992976 + 37687321 = 6324^2 + 6139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77680297 is a prime.

It is not a weakly prime, because it can be changed into another prime (77680397) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38840148 + 38840149.

It is an arithmetic number, because the mean of its divisors is an integer number (38840149).

Almost surely, 2^77680297 is an apocalyptic number.

It is an amenable number.

77680297 is a deficient number, since it is larger than the sum of its proper divisors (1).

77680297 is an equidigital number, since it uses as much as digits as its factorization.

77680297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 77680297 is about 8813.6426635075. The cubic root of 77680297 is about 426.6813158897.

It can be divided in two parts, 77680 and 297, that added together give a palindrome (77977).

The spelling of 77680297 in words is "seventy-seven million, six hundred eighty thousand, two hundred ninety-seven".